Jarring devices



c. R. LYLEs JARRING DEVICES Aug. 31, 1965 4 Sheets-Sheet l Filed May 4, 1961 Willi ""5 2 lll G. .m

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INVENTOR. C. R LYLES BY iV/4mm ATTORNEY Aug. 3l, 1965 c. R. LYLEs JARRING DEVICES Filed May 4, 1961 4 Sheets-Sheet 2 gag@ INVENTOR. C. R. YL ES ATTORNEY Aug. 31, 1965 c. R., LYLl-:s

JARRING DEVICES' 4 Sheets-Sheet 3 Filed May 4. 1961 INVENTOR. C. l?. LYLES glx/TTORNEY All@ 3, 1965 c. R` LYLl-:s 3,203,482

JARRING DEVICES IN VEN TOR.

C. LYLES ATTO R N EY United States Patent O 3,203,432 EARRING DEVICES Cecil Ray Lyles, 1301 Cooley St., Borger, Tex. Filed May 4, 1961, Ser. No. 107,837 8 Claims. (Ci. 1166-178) This invention relates to oil well tools. More particularly, this invention relates to jarring devices for use in oil wells for controlling other tools or instruments in said well. Yet more particularly, this invention relates to jarring devices for moving other tools within a well hole.

One object of this invention is to provide a mechanism operable down well and controllable from the surface for controlling the position of components in an oil well tool.

Another object of this invention is to provide an improved releasable locking mechanism.

Another object of this invention is to provide a well tool providing a controllable upward jarring action on a tool down well.

Yet another object of this invention is to provide a well tool to provide a controllable downward jarring action on a tool down well.

Yet another object of this invention is to provide an apparatus which may be readily assembled to provide either an upward or a downward controlled jarring action.

Other objects of this invention will be apparent to those skilled in the art on study of the below disclosure of which the drawings attached hereto form a part.

In the attached drawings, wherein like numerals denote like parts in the various gures:

FIGURE l is an over-all diagrammatic longitudinal view of one jarring tool device of this invention adapted to provide an upward jarring action, the components of this device being shown in a beginning operative position in a well and said device being shown broken away in part along the section indicated by 1A-1B of FIG- URE 7;

FIGURE 2 is a view of the jarring tool shown in FIG- URE 1 viewed in the same manner as shown in FIGURE l and in a stage of operation subsequent to that shown in FIGURE 1;

FIGURE 3 is a view of the jarring tool shown in FIG- URE l viewed in the same manner as in FIGURE 1 and showing a stage of operation subsequent to that shown in FIGURE 2;

FIGURE 4 is an enlarged view of the components and portions of the tool shown in zone 4A-4B-4C-4D of FIGURE 1;

FIGURE 5 is an enlarged view of the components and portions of the tool shown in the zone SA-SB-SC-SD of FIGURE 2;

FIGURE 6 is an enlarged view of the components and portions of the tool shown in zone 6A-6B-6C6D of FIGURE 3;

FIGURE 7 is an enlarged cross sectional View taken along the plane indicated by arrows 7A and 7B of FIG- URE 4;

FIGURE 8 is an enlarged cross sectional view along the plane indicated by arrows 8A and SB of FIGURE 6;

FIGURE 9 is an enlarged cross sectional View of another embodiment of the device of FIGURE 1 of this invention viewed along a plane corresponding to that indicated by arrows 7A and 7B of FIGURE 4;

FIGURE 10 is an overall diagrammatic longitudinal View of a second embodiment of this invention shown partly in central section, as FIGURE 1; this second embodiment of this invention is adapted to jar downward, the components of this embodiment are shown in this FIGURE 10 in a beginning operative position, viewed broken away in part along the section indicated by plane 10A-10B of FIGURE 16;

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FIGURE 11 is a longitudinal view, shown partly in section, of the device shown in FIGURE 10, viewed in the same manner as in FIGURE 10, in a stage of operation subsequent to that shown in FIGURE 10;

FIGURE 12 is a'view of the device shown in FIGURE 11, and similarly shown, in a stage subsequent to that shown in FIGURE 1l;

FIGURE 13 is an enlarged View of the zone 13A-13B- 13C-13D of FIGURE l0;

FIGURE 14 is an enlarged view of zone 14A-14B- 14-C-14D of FIGURE 11;

FIGURE 15 is an enlarged View of zone 15A-15B 15C-15D of FIGURE 12;

FIGURE 16 is a cross sectional view along plane 16A- 16B of FIGURE 13; and

FIGURE 17 is a cross sectional View along plane 17A- 17B of FIGURE 15.

One embodiment of this invention comprises a jarring tool shown generally as 31 in FIGURE 1. Said jarring tool operates on a well tool or fish, shown generally as 32, in cooperation with a rod string, shown generally as 33, thereabove and connected firmly to said tool 31.

The tool 31 comprises an elongated sleeve subassembly 35, a plunger subassembly 37, a detent carrier subassembly 39, a main spring 41, and a snubber spring 42.

The sleeve subassembly 35 is composed of an upper solid male union head member 44 with a male thread 45 thereabove and a tubular upper sleeve 46 firmly attached to the lower end of said union. The sleeve 46 is attached to a hollow male union or collar 47 the upper portion of which provides an upper shoulder 48 interior to the interior wall of sleeve 46. The lower portion of this union or collar provides a lower shoulder 49. A hollow lower sleeve 50 is firmly attached at its upper end to the lower portion of union 47 and is attached at its lower end to a hollow male coupling 52 which coupling is provided with an internal shoulder 53 which projects internally of the sleeve 50.

The plunger subassembly 37 comprises an elongated solid cylindrical shaft 56, a lower end socket 57, and a centrally located thrust collar 53; this collar is provided with an upper laterally projecting shoulder 59 and a lower laterally projecting shoulder 60. The socket 57 firmly 'the sleeve 50. The collar 58 has a greater external diameter than the internal diameter of the hollows of couplings or collars 47 and 52. The upper portion of the shaft 56 is provided with an external annular recess 63 close to the top 65 of said shaft.

The detent carrier subassembly 39 comprises a detent carrier sleeve 39A having an upper thicker annulazi portion 67 and .a lower thinner annular portion 69, both having the same outer diameter. A shoulder 70 is provided between the thicker portion 67 and the thinner tubular portion 69. The outer surface of rdetent sleeve 39A of subassembly 39 is shown as 68.

The helical spring 41 extends into the space which is internal to said lower detent carrier sleeve portion 69 and external to the shaft 56.

The portion 67 of sleeve 39A of detent subassembly 39 is perforated by a plurality of diametrically extending ball retaining passageways, 71, 72, 73, 74, 75, and 76, passing through said portion 67; detent balls S1, 82, 83, 84, 85, and 86 are contained in passageways 71, 72, 73, 74, 75, and 76, lrespectively. The diameter of these balls is slightly greater than the thickness of portion 67 of the detent sleeve 39A. The outer surface 68 of the Wall of the detent sleeve 39A slidably fits within the interior wall 87 of the sleeve 46; the interior surface 78 of the upper portion 67 of the detent sleeve 39A slidably yet freely fits over and about the shaft 56. The detent balls each project for about 1/4 of their diameter from the internal orifice of each of the passages, as 71 through 76, at surface 78 when the detent subassembly is in the position shown in FIGURES l and 4; that is, when the outer portion of each detent ball is adjacent to and contacts the inner surface 87 of the tube 46. This amount of projection of the balls provides for a reliable locking action between the shaft 56 and the detent subassembly. The annular recess 63 on the shaft 56 is of sufficient depth, that is, slightly more than 1A the diameter of the detent balls, 81 through 86, in order to receive those balls as shown in FIGURES 4 and 7 and provide effective locking action by those balls between shaft 56 and subassembly 39. The small angle of each of the recess walls relative to the walls of shaft 56 at their zone of contact permits ready passage of the locking balls in and out of each such recesses.

As shown in FIGURES 4, 5, 6, and 7, the internal orifices of each of passageways 71 through 76 (such as 91 through 96, respectively) to surface 78 are of smaller size than the size of the balls, 81 through 86, respectively; more particularly, in the preferred embodiment the orifices 91 through 96 each are circular and of a smaller diameter than the maximum diameter of each of the balls 81 through 86, respectively, all of which balls are the same size.

Accordingly, in the position shown in FIGURES 1 and 4, the balls 81 through 86 act as locking members to cause the shaft 56 and the detent carrier subassembly 39 to travel vertically together.

The lateral portions of each of the passages, 71 through 76, opening to surface 87 have a larger diameter than the detent balls 81 through 86. Accordingly, the detent balls may freely pass laterally from said orifices, 71 through 76, respectively, when there is space lateral of said orifices as described below.

The internal surface, 87, of the upper portion of the sleeve 46 is provided with two annular recesses 54 and 55. These are semi-circular in outline and are open onto surface 87. In the preferred embodiment below described in detail, these lrecesses each have a depth about 1A of the diameter of balls 81 through 86.

The snubber spring 42 is located between shaft head 65 and the base 99 of union 44. The distance between the annular recess 55 and said base 99 is much smaller than the distance between the balls 81 through 86 and the shoulder 48 of the collar 47. Vent ports, as 100, are provided in sleeve 46 between the top 65 of the shaf-t 56 and the base 99.

In operation, tension is applied to the uppermost portion of the drill string 33 as at a hook 101 at the top of said string. Accordingly, such tension is applied through said string to the head member 44 and thence to the sleeve 46 down to the shoulder 48. This upward force is transferred by the spring 41 to the shoulder 70 of detent carrier sleeve 39A of subassembly 39.

In the position shown in FIGURE l, the balls 81 through 86 and walls of passageways 71 through 76 transfer this upward force to the upper shoulder of the annular recess 63 and thence to the shaft 56. The shaft 56 attaches by the socket 57 to the tool 32.

The utilization of the elasticity of the string of drill pipe 33 between the uppermost support member 101 thereof and the tool 32 is an important part of this invention. A pipe, or drill string, as 33, is usually 1,000 to 6,000 feet long and has a substantial capacity for elastic stretch within the demand for elastic energy for lthe upward jarring effected by tool 31. On application of upward force to a tension support member, as 101, at

the -top of string 33 and usually above the surface of the ground, the string 33 stretches as the tool 32 or other item to which the socket 57 is attached does not yield or change its position. This provides an elastic stretch in the drill string of at least several inches when the string is even a few hundred feet long, as is known according to Youngs modulus for steel which is about 30,000,000 for drill pipe steel.

Accordingly, application of even a gradual upward force on the top of a string as 33 stores a substantial amount of elastic energy in that drill string. Tension in string 33 thus causes a corresponding compression of the spring 41 and the spring 41 will accordingly shorten as the force supported thereby is increased. As the spring 41 shortens, the tubular member 35 will move upward relative to the shaft 37 and, more particularly, sleeve 46 and groove 55 therein move upward relative to the plunger 37. This motion of the tubular member 35 and of sleeve 46 relative to the plunger 37 brings the detent carrier sleeve 39A and balls 81 through 86 therein from the position shown in FIGURE 1 and FIG. 4 to a lower position relative to the sleeve 46, whereupon the balls 81 through 86 carried in the orifices 71 through 76 a-re brought opposite to the recess 55 in the tube 46 as shown in FIGURES 2 and 5.

At the position of the component parts shown in FIGURES 2 and 5 the sleeve 46 is under the tension applied to the member 101 tending to move said sleeve upward. The balls 81 through 86 in this position of components are in a position whereat the ball retaining passages, as 71 through 76 for each of said balls, are open laterally to the annular recess 55 in sleeve 46. The then fixed position of the shaft 56 of the plunger 37 relative to fish 32 and the presence of lateral components of force applied to the balls 81 through 86 by the upper wall of recess 63 move the balls 81 through 86 laterally. Accordingly, under the impetus of the tension then in the elastic rod string 33, the tubular subassembly 35 moves upward after thus being freed (by the lateral motion of locking balls 81 through 86 from, out of recess 63) of further restraint by the shaft 56. This upward motion of the tubular member 35 brings the shoulder 53 sharply and forcefully upward to strike and jar the lower shoulder 60 of the collar 58 of the shaft 56. This sharp motion is transmitted to the collar 57 and thence to the fish 32, thereby transmitting a sharp strong upward jar to the fish 32.

Vent ports are provided in sleeve 46 immediately below base 99, immediately below shoulder 49 and immediately above shoulder 53 for tube 50.

While in the preferred embodiment, spherical locking elements as 81 through 86 of V16 inch diameter are shown and the shaft 56 is shown as cylindrical in section throughout its entire length, it is within the scope of this invention that the locking elements used be small cylinders of the same diameter rather than balls; accordingly, as shown in FIGURE 9, short cylinders, 111 through 116, are used as the locking elements rather than spherical balls, as 81 through 86. Additionally, in such device the shaft 56 is hexagonal in section and provided with a hexagonal recess as 119 and, also, with hexagonal shaped walls as 117 to facilitate the movement of such cylindrical locking elements, as 111 through 116, in and out of their locking and freely movable positions. For this purpose, the sleeve 46 may also be given a hexagonal inner surface as shown in FIGURE 9 which provides larger area of bearing contact surface for greater strength as needed.

When the tool 31 is in the position shown in FIGURE 3, tool 31 can then be used to lift the fish 32 to carry same to the surface or to locate it elsewhere in the well tubing as desired. If the above described jarring action does not effect a desired loosening, then the tool 31 may be lowered relative to fish 32; this will bring the annular recesses 55 in the sleeve 46 again adjacent to the orifices 71 through 76 in the detent carrier sleeve 39A. Accordingly, the balls 81 through 86 will, this time urged by the release of the compression of the compressed spring 41 tending to move said balls upward, in cooperaltion with the inward slope of top of groove 55, move into recess 63, so that balls 81 through 86 provide a locking engagement between the detent carrier subassembly 39 and the shaft 56. The decompression of the spring 41 on the above described downward motion of the sleeve 46 (which will be effected by the release of tension on the tension member 101) brings the detent carrier and balls 81 through 86 to the position shown in FIGURES 1 and 4. From this position the jarring action above described may be repeated. This repetition, of course, is effected each time with only such jarring action force as is predetermined; that is, one can set the jarring tool to strike the fish 32 with a force of, say, 300 pounds, and, repeat this jarring action several times until loosening of the fish is achieved or it is decided that a greater force is necessary. This device of this invention provides a jarring action of larger force by providing a stronger spring 41 or a greater distance from the normal (FIG. 1) resting position of the balls in the orifices 71 through .76 in the detent carrier sleeve 39A to the lower recess 55 in the sleeve 46 with the same strength of spring. Heretofore, it has been difficult to apply a controlled upward jarring action to a tool at the end of an elastic rod string due to the absorption of the jarring energy by the tubing string itself.

According to this invention, the energy storage capacity of the tubing string itself is utilized in combination with this tool 31 to effect such a quantitative amount of upward jarring action as is desired, as above described.

In a modification of this device, shown in FIGURES l0 through 15, included within the scope of this invention, a downward jarring tool 131 is providedfmerely by the reversal of certain of the elements in the device 31 of FIGURES 1 through 8 above described.

The downward jarring tool 131 operates on a well tool or fish shown generally as 132 in cooperation with a rod string shown generally as 133 and connected firmly to said tool 131.

The tool 131 comprises an elongated sleeve subassembly 135, a plunger subassembly 137, a detent carrier subassembly 139, a main spring 141, and a snubber spring 142.

The sleeve subassembly 135 is composed of a lower solid male union head member 144 with a female thread 145 therebelow and a lower tubular sleeve 146 firmly atttached to the upper end of said union. The sleeve 146 is attached to a hollow male union or collar 147, the lower portion of which provides a lower shoulder 148 interior to the interior wall of sleeve 146. The upper portion of this union or collar provides an upper shoulder 149. A hollow upper sleeve 158 is attached to the upper portion of union or collar 147 and is attached at its upper end to a hollow end male coupling 152 which coupling is provided with an internal shoulder 153. The plunger subassembly 137 comprises an elongated solid cylindrical shaft 156, an upper end collar 157, and a centrally located thrust collar 158; this collar is provided with an upper laterally projecting shoulder 160 and a lower laterally projecting shoulder 159. The collar 157 firmly attaches, as by a standard male thread 161, to the rod string 133. In an embodiment of this modification, the vertical shaft 156 is cylindrical in horizontal cross section and fits in the' circular hollow of the coupling 152 and the union or collar 147; the spring 141 is helical and freely fits in the annular space, as 162, between the lower portion of the shaft 137 and the lower sleeve 146. The thrust collar 158 is cylindrical in horizontal cross section and freely slidably fits within the sleeve or tube 150. The thrust collar 158 has a greater outer diameter than the internal diameter of the hollows of collars or cou- 6 plings 147 and 152. The lower portion of the shaft 156 is provided with an annular recess 163 close to the bottom 165 of said shaft.

The detent carrier assembly 139 comprises a detent carrier sleeve 139A having an upper thicker annular portion 167 and a lower thinner annular tubular portion 169, both having the same outer diameter. A shoulder 170 is provided between the thicker portion 167 and the thinner tubular portion 169. The outer surface of detent sleeve 139A is shown as 168. The helical spring 141 fits internal to said lower detent sleeve portion 169 and external to the shaft 156.

The detent sleeve 139a is perforated by a plurality of diametrically extending passageways 171, 172, 173, 174, and 176, passing through said portion 167; detent balls 181, 182, 183, 184, and 186 are contained in passageways 171, 172, 173, 174, 175, and 176, respectively. The diameter of these balls is slightly greater than the thickness of portion 167 of the detent sleeve. The outer surface 168 of the detent sleeve slidably ts within the interior surface 187 of the sleeve 146; the interior surface 178 of lthe upper portion of the detent sleeve slidably yet freely lits over and about the shaft 156. The detent balls each project about 1A of their diameter interiorly from the internal orifices of the passageways, as 171 through 176, at surface 178 when the detent subassembly is in the position shown in FIGURES 10 and 13, that is, when the outer portion of each ball is adjacent to and contacts the inner surface 187 of the tube or sieeve 146. The balls thus project inwardly sufficiently to provide a reliable locking action between the shaft 156 and sleeve 139A of the detent subassembly 139.

The annular recess 163 on the shaft 156 is of sufficient depth, that is, slightly more than 1A of the diameter of the balls 181 through 186, in order to receive those balls as shown in FIGURES 13 and 16 and to provide effective locking action by those balls between the shaft 156 and the dentent subassembly 139. The small angle of slope of the recess walls relative to walls of the shaft 156 at their contact permits ready passage of the locking balls in and out of such recess. As shown in FIGURES 13 through 17, the passageways 171 through 176 have their internal orifices to surface 178, such as 191 through 196, respectively, of smaller size than the size of the balls 181 through 186, respectively; more particularly, in an embodiment of this modification, the orifices 191 through 196 are circular and of a smaller diameter than the maximum diameter of each of the balls 181 through 186, respectively, all of which balls are the same size..

Accordingly, in the position shown in FIGURES 13 and 16, the balls 181 through 186 act as locking members to cause the shaft 156 and the detent carrier subassembly 139 to travel vertically together.

The lateral portions of each of the orifices 171 through 176 have a larger diameter than the detent balls 181 through 186. Accordingly, the detent balls may freely pass laterally from said orifices 171 through 176, respectively, when there is space lateral of said orifices as described below.

The internal surface 187 of the upper portion of the sleeve 146 is provided with an annular recess 155, semi-circular in outline and open onto surface 187. In the embodiment below described in detail this recess has a depth of about 1A of the diameter of each of the detent balls, 181 through 186.

The spring 142 is located between detent sleeve 139A and the shoulder 148 of union or collar 147. The distance between the annular recess 155 and the shoulder 148 is much smaller than the distance between the detent balls (181 through 186) and the base 199 of the union 144. Vent ports as 200 are provided between the top edge of detent sleeve 139A in its topmost position as shown in FIGURES 10 and 13 and the shoulder 148.

In operation a compressive force is applied to the uppermost portion of the drill string 133, as to an anvil 201 at the top thereof. The compressive force is transmitted through the string 133 to the upper end collar 157 of tool 131. This downward force is transmitted via the upper shoulder of annular recess 163 to the balls 181 through 186 therein; thence via walls of the ball retaining passages 171 through 176 to shoulder 170 of detent sleeve 139A and spring 141, bea-ring against base 199 of union 144 which union is attached to fish 132. The utilization of the elasticity of the string drill pipe 133 between anvil 201 and upper end collar 157 of tool 131 is an important part of this invention, as such has, for reasons above discussed, adequate elasticity and length to provide a substantial jarring action. Accordingly, on application of downward force to a compression member, as anvil 201, at top of string 33 and usually located above the surface of the ground, the string 133 elastically compresses as the fish 132 or all other items to which the union 144 is attached do not yield or change their position. This provides an elastic compression in the drill string of up to several inches, which is entirely adequate for jarring purpose. One feature of this invention is that the amount of jar is kept within a desirable controlled maximum that does not harm the fish. Application of compression to shaft 156 causes a corresponding compression and shortening of the spring 141.

Accordingly, plunger shaft 156 moves downward relative to sleeve 146 as compression is continued to be applied to the head of the tool 131. This motion of the plunger subassembly 137 brings the detent carrier subassembly 139 to a lower position relative to the sleeve 146 whereupon the balls 181 through 186, carried in the orifices 171 through 176, are brought opposite to the recess 155 in the tubular sleeve 146, as shown in FIGURES 11 and 14, from their initial position shown in FIGURES 10 and 13.

At the position of the component parts shown in FIG- URES 11 and 14 the shaft 156 is under the compression applied to the member 201 tending to move said shaft downward. The balls 181 through 186 in this position of components are in a position whereat the ball retaining passages as 171 through 176 for each of said balls are open laterally to the annular recess 155. The then fixed position of the tubular sleeve 146 relative to fish 132 and the lateral component of force applied by the wall of recess 163 to balls 181 through 186 urges and moves the balls 181 through 186 laterally. Accordingly, under the impetus of the compressive force in the elastic rod string 133, the plunger subassembly 137 is moved downward after thus being freed, by this lateral motion of locking balls 181 through 186 from out of their recess 163, of further restraint by the detent carrier subassembly 139. This downward release and motion of the shaft 156 brings the shoulder 159 downward sharply and forcefully to strike and jar the upper shoulder 149 of the union or collar 147 of the sleeve subassembly 135. This sharp motion is transmitted to the union 144 and thence to the fish 132, thereby transmitting a quantitatively controllable jar to the fish 132.

Vent ports, as 200, are provided in tube 146 immediately below shoulder 148, immediately above shoulder 149 and immediately below shoulder 153 for the sleeve or tube 150.

While in the above described embodiment of this modification, spherical locking elements as 181 through 136 of /5 inch diameter are shown and the shaft 156 is shown as cylindrical in section throughout its entire length, it is within the scope of this invention that the locking elements used be small cylinders and a portion of the shaft be hexagonal as shown and discussed for FIGURE 9 above.

When the tool 131 is in the position shown in FIGURE 10, tool 131 can also then be used to lift the fish 132 to carry same to the surface or to locate yit elsewhere in the well tubing as desired. If the above described jarring action does not effect a desired loosening, then the shaft 156 may be raised: this will bring the annular recess 155 in the tubular sleeve 146 adjacent to the orifices 171 through 176 in the detent carrier sleeve 139A. Accordingly, the balls 181 through 186 will, this time urged by the release of the compression of the compressed spring 141 tending to move said balls upward, in cooperation with the shape of recess 155, move into recess 163, and so again the balls 181 through 186 effect locking engagement between the detent carrier 139 and the shaft 156. The decompression of the spring 141 on the above described upward motion of the shaft 156 (which will be effected by the release of pressure on the anvil member 201) brings the detent carrier sleeve 139A and balls 181 through 186 to the position shown in FIGURES 10 and 13. position, the controlled jarring action above described, may be repeated. This repetition, of course, is effected each time with only such force of jarring action as is predetermined: that is, one can set the jarring tool to strike the fish with a force of, say, 300 pounds and repeat this jarring action several times until successful loosening of the fish is achieved or it is decided that a greater jarring force is necessary. The device of FIGURES 10 through 17 of this invention thus may provide a downward jarring action of any desired force by providing a stronger spring 141 or a greater distance from the normal resting position of the locking balls 131 through 186 (in the orifices 171 through 176 in the detent carrier 139) to the recess 155 in the tube 146 with the same strength of spring. Heretofore, it has been difficult to reliably apply a downward jarring action of predetermined maximum energy to a tool at the end of a string of rods. According to this invention, the energy storage capacity of the tubing string released is limited by spring 141 to release such a quantitative amount of downward jarring action as is desired.

Having thus described preferred embodiments of the means by which the objects of this invention are obtained, modifications thereof within the skill of the art are intended to be included within the scope of the appended claims.

I claim:

1. A jarring tool comprising a first sleeve, a second sleeve and a first collar therebetween, a shaft slidably located within said sleeves and collar, a second collar on said shaft, a releasable detent means attachable to said shaft located between said shaft and one of said sleeves, a spring located in one of said sleeves, a laterally projecting thrust collar firmly attached to said shaft, said first sleeve having a first internal chamber therein, one end of said first sleeve being open, the other end of said first sleeve being firmly attached to said first collar, said first collar having a central orifice narrower 'than said first internal chamber, and said second sleeve being firmly attached at one end to said first collar, said first and second sleeves and said first collar being coaxial, said second sleeve having a second internal chamber therein of larger cross-section than the cross section of said orifice in said first collar and an internal shoulder firmly attached to said second sleeve at one end thereof, said shaft slidably passing through said first end of said first sleeve and said central orifice in said first collar and terminating at a free end in said second internal chamber, said laterally projecting thrust collar being located within the first sleeve, said thrust collar having a larger external diameter than the interior diameter of said first collar, said spring supported on said internal shoulder attached to one end of said second sleeve ,at one end of said spring and at its other end attached to said shaft by said releasable detent means and means on said second sleeve to engage and release said releasable detent means from said shaft after a predetermined movement of said releasable detent means and the end of said shaft toward the said support for said spring.

From this 2. A combination comprising the jarring tool of claim 1, with a string of rods and a well tool, said string of rods being attached to one end of said jarring tool and said well tool being attached to the other end of said jarring tool.

3. The jarring tool of claim 1 wherein` the releasable detent means comprises .a ltubular detent sleeve with an inner wall surface and an outer wall surface, a plurality of passageways in said sleeve, each extending from an openingin said inner wall surface to an opening in said outer wall surface of said detent sleeve, a movable detent ball in each such passageway, each said detent ball having a greater thickness than said detent sleeve, said second sleeve of said jarring tool having an inner sleeve wall surface adjacent to and closely yet slidably fitting the outer wall surface of said detent sleeve, means in each passageway in said detent sleeve preventing complete escape of the detent ball therein from the end of each said passageway `adjacent to the inner wall of said tubular detent sleeve,

and wherein the means `on said second lsleeve adapted to engage and release said releasable detent means lcomprises an annular recess in sai-d second sleeve wall surface said recess being adapted to receive a suffidiently large portion of each said detent ball that one of said detent balls when seated in said recess does not project beyond the inner wall surface of said detent sleeve and wherein said shaft comprises an outer wall surface closely yet slidably fitting the inner wall surface of said detent sleeve, and in the outer wall surface of said shaft a recess adapted to receive a sufiiciently large portion of each of said detent balls to seat a detent ball partly in said recess and partly in a 'passageway in said detent sleeve without said ball projecting beyond the outer wall surface of said detent sleeve.

4.- A- jarring tool comprising a first lower sleeve and a first collar at its lower end, a second upper sleeve, a second collar between said first and second sleeves, a shaft slidably located within said sleeves and collars, a releasable detent means attachable to said shaft and located between said shaft and one of said sleeves, resilient means located in one of said sleeves and a laterally projecting thrust collar firmly attached to said shaft, said first lower sleeve having a first internal chamber therein, said first collar being at the bottom end of said first sleeve, an orifice in said first collar open to said chamber and open below, the upper end of said first sleeve being attached to said second collar, said second collar having an upwardly facing internal shoulder and a central orifice narrower than said first chamber internal width, the second upper sleeve being :attached to the top of said second collar, said first and second sleeves and orifices in said first and second collars being coaxial, said upper sleeve having an upper sleeve chamber therein with larger internal diameter than t-he diameter of sai-d orifice in said second collar, and an internal shoulder on said second collar firmly attached to said second sleeve at one end thereof, said shaft having one, lower, end portion extending below and passing upwardly through said orifice in said first collar and the chamber in said first sleeve and terminating at a free end in said upper sleeve chamber, said laterally projecting thrust collar being fixed on said shaft and located in said first internal chamber, said thrust collar being of larger external diameter than the diameter of said orifice in said first collar, said resilient means being supported at one end by said internal shoulder on said second collar and located in said upper sleeve and attached at another end to said shaft by said releasable detent means, means on said second `sleeve to engage and release said releasable detent means from said shaf-t after a 10 predetermined movement of said releasable detent means and of the free end of said shaft toward said second collar. A5. The combination of the jarring .tool of claim 4 with 1a string of rods and a wel-l tool, said rod string being attached to the upper end of said upper sleeve,

i: and said well tool attached to the lower end of said shaft.

6. The jarring tool of claim 4 wherein the releasable detent means comprises a tubular detent sleeve with an inner wall surface and an outer wall surface, a plurality of passageways in said sleeve, each extending from said inner to said outer wall surface of said detent sleeve, a movable detent ball in each such passageway, each said detent ball having a greater thickness than the thickness of said detent sleeve, said second sleeve of said jarring tool having an inner sleeve wall surface closely yet slidably fitting the outer wall surface of said detent sleeve, means in each passageway in said detent sleeve preventing complete escape of the detent ball :therein from the end of each said passageway distant from said outer detent sleeve wall, and wherein the means on said second sleeve adapted to engage and release said releasable detent means comprises an annular recess in said second sleeve Wall surface said recess being adapted to receive a sufficiently large portion of each said detent ball that each said detent ball seated in said recess does not project beyond the inner wall surface of said detent sleeve, and wherein said shaft member comprises an outer wall surface closely yet slidably fitting the inner wall surface of said detent sleeve, and, in the outer wall surface of said shaft, a recess adapted to receive a sufficiently large portion of each said detent ball to seat said detent ball partly in said recess and partly in a passageway in said detent sleeve without said ball projecting beyond the outer wall surface of said detent sleeve. 7. A jarring tool comprising a first upper sleeve and a first collar attached thereto, a second lower sleeve and a second collar attached thereto and to said first sleeve, a shaft slidably located within said sleeves and collars, a releasable detent means attachable to said shaft and located between said shaft and one of said sleeves, resilient means located in one of said sleeves, and a laterally projecting thrust collar attached to said shaft, said first, upper, sleeve having a first internal chamber therein, said first collar being at the top end of said first sleeve, an orifice in said collar open to said chamber and open above, the lower end of said first sleeve being attached to said second collar, said second collar having a central orifice narrower than said first chamber internal width, said second, lower, sleeve having a second internal chamber therein and being attached at its top to the bottom of said second collar and an internal shoulder firmly attached to said second sleeve at the end thereof at the bottom of said chamber, said first and second sleeves and first and second collars being coaxial, said second internal chamber in said lower sleeve having a larger internal diameter than the diameter of said orifice in said second collar, said shaft having its upper end portion extending above and passing downwardly through said orifice in said first collar and the chamber in said first sleeve and through said orifice in said second collar and terminating at a free end in said second internal chamber, said laterally projecting thrust collar fixed on said shaft and located in said first chamber, said thrust collar being of larger external diameter than the diameter of said orifice of said first collar, said resilient means supported at one end `on said internal shoulder attached to the bottom of said lower sleeve and located in said lower sleeve and attached to said shaft by said releasable detent means, means on said second sleeve to engage and release said releasable detent means from 1 1 said shaft after a predetermined motion of said releas- 2,330,258 able detent means and of the free end of said shaft toward 2,342,367 the bottom of said second sleeve. 2,518,542 8. The combination of the jarring tool of claim 7 with 2,634,102 a well tool attached to the bottom of the lower sleeve, 2,637,402 and a rod string attached to the upper end of said shaft. y2,703,589

References Cited by the Examiner UNITED STATES PATENTS ,21835474 1,214,622 2/17 Walker 166-178 10 2,872,158 1,944,481 1/34 Wells 166-178 2,060,403 11/36 Sweet 166-239 2,122,751 7/38 Phipps 175-299 Baker 166-239 Pryor 166-165 Hanson 285-277 Howard 175-299 X Baker et al. 166-120 Masek 285-277 Rafferty 285--277 X Beck 175-320 X OConnor et a1 175-304 X Green 175-299 CHARLES E. OCONNELL, Primary Examiner. BENJAMIN BENDETI, Examiner. 

1. A JARRING TOOL COMPRISING A FIRST SLEEVE, A SECOND SLEEVE AND A FIRST COLLAR THEREBETWEEN, A SHAFT SLIDABLY LOCATED WITHIN SAID SLEEVES AND COLLAR, A SECOND COLLAR ON SAID SHAFT, A RELEASABLE DETENT MEANS ATTACHED TO SAID SHAFT LOCATED BETWEEN SAID SHAFT AND ONE OF SAID SLEEVES, A SPRING LOCATED IN ONE OF SAID SLEEVES, A LATERALLY PROJECTING THRUST COLLAR FIRMLY ATTACHED TO SAID SHAFT, SAID FIRST SLEEVE HAVING A FIRST INTERNAL CHAMBER THEREIN, ONE END OF SAID FIRST SLEEVE BEING OPEN, THE OTHER END OF SAID FIRST SLEEVE BEING FIRMLY ATTACHED TO SAID FIRST COLLAR, SAID FIRST COLLAR HAVING A CENTRAL ORIFICE NARROWER THAN SAID FIRST INTERNAL CHAMBER, AND SAID SECOND SLEEVE BEING FIRMLY ATTACHED AT ONE END TO SAID FIRST COLLAR, SAID FIRST AND SECOND SLEEVES AND SAID FIRST COLLAR BEING COAXIAL, SAID SECOND SLEEVE HAVING A SECOND INTERNAL CHAMBER THEREIN OF LARGER CROSS-SECTION THAN THE CROSS SECTION OF SAID ORIFICE IN SAID FIRST COLLAR AND AN INTERNAL SHOULDER FIRMLY ATTACHED TO SAID SECOND SLEEVE AT ONE END THEREOF, SAID SHAFT SLIDABLY PASSING THROUGH SAID FIRST END OF SAID FIRST SLEEVE AND SAID CENTRAL ORIFICE IN SAID FIRST COLLAR AND TERMINATING AT A FREE END IN SAID SECOND INTERNAL CHAMBER, SAID LATERALLY PROJECTING THRUST COLLAR BEING LOCATED WITHIN THE FIRST SLEEVE, SAID THRUST COLLAR 